<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            height: 50px;
            width: 50px;
            background: red;
            transition: width 1s cubic-bezier(0.63, 0.15, 0.31, 1.5);
        }
        div:hover {
            width: 200px;
        }
    </style>
</head>
<body>
    <div></div>

</body>
</html>